Name: a simple non-invasive method for temporary knockdown of upper limb proprioception
Uploaded: 2018-03-03T14:00:00
Description: Watch this Scientific Journal Video about A Simple Non-invasive Method for Temporary Knockdown of Upper Limb Proprioception at JoVE.com

The authors would like to acknowledge Jon Nelson PhD, PT, for conducting the analysis to confirm the vibration frequency of the vibrator used in this protocol.

The Institutional Review Board at the College of St. Scholastica has approved the study under which this protocol was developed and tested.
NOTE: The manufacturer&#39;s specifications of the vibrator used in this protocol indicated that the frequency on &#39;high&#39; was 11,00 rpm (183.3 Hz). This frequency was confirmed using a sample of vibration data collected through one input of a differential amplifier sampled at 2 kHz. The mean period of the signal was 5.56 x 10-3 s, which i...

<ol>
	<li>Dukelow, S. P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Quantitative+assessment+of+limb+position+sense+following+stroke.">Quantitative assessment of limb position sense following stroke.</a> Neurorehabilitation and neural repair. 24, 178 (2010).</li><li>Cappello, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Robot-aided+assessment+of+wrist+proprioception.">Robot-aided assessment of wrist proprioception.</a> Frontiers in human neuroscience. 9, (2015).</li><li>Han, J., Waddington, G., Adams, R., Anson, J., Liu, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessing+proprioception:+a+critical+review+of+methods.">Assessing proprioception: a critical review of methods.</a> Journal of Sport and Health Science. 5, 80-90 (2016).</li><li>Goble, D. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Proprioceptive+acuity+assessment+via+joint+position+matching:+from+basic+science+to+general+practice.">Proprioceptive acuity assessment via joint position matching: from basic science to general practice.</a> Physical therapy. 90, 1176-1184 (2010).</li><li>Meyer, S., Karttunen, A. H., Thijs, V., Feys, H., Verheyden, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=How+do+somatosensory+deficits+in+the+arm+and+hand+relate+to+upper+limb+impairment,+activity,+and+participation+problems+after+stroke?+A+systematic+Review.">How do somatosensory deficits in the arm and hand relate to upper limb impairment, activity, and participation problems after stroke? A systematic Review.</a> Physical Therapy. 94, (2014).</li><li>Elangovan, N., Herrmann, A., Konczak, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessing+proprioceptive+function:+evaluating+joint+position+matching+methods+against+psychophysical+thresholds.">Assessing proprioceptive function: evaluating joint position matching methods against psychophysical thresholds.</a> Physical therapy. 94, 553 (2014).</li><li>Aman, J. E., Elangovan, N., Yeh, I. L., Konczak, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+effectiveness+of+proprioceptive+training+for+improving+motor+function:+a+systematic+review.">The effectiveness of proprioceptive training for improving motor function: a systematic review.</a> Frontiers in human neuroscience. 8, (2014).</li><li>Thiemann, U., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cortical+post-movement+and+sensory+processing+disentangled+by+temporary+deafferentation.">Cortical post-movement and sensory processing disentangled by temporary deafferentation.</a> Neuroimage. 59, 1582-1593 (2012).</li><li>Furmanek, M. P., S&#322;omka, K., Juras, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+effects+of+cryotherapy+on+proprioception+system.">The effects of cryotherapy on proprioception system.</a> BioMed research international. 2014, (2014).</li><li>Costello, J. T., Donnelly, A. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cryotherapy+and+joint+position+sense+in+healthy+participants:+a+systematic+review.">Cryotherapy and joint position sense in healthy participants: a systematic review.</a> Journal of athletic training. 45, 306-316 (2010).</li><li>Weerakkody, N., Mahns, D., Taylor, J., Gandevia, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impairment+of+human+proprioception+by+high-frequency+cutaneous+vibration.">Impairment of human proprioception by high-frequency cutaneous vibration.</a> The Journal of physiology. 581, 971-980 (2007).</li><li>Boucher, J. A., Normand, M. C., Boisseau, &. #. 2. 0. 1. ;., Descarreaux, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sensorimotor+control+during+peripheral+muscle+vibration:+An+experimental+study.">Sensorimotor control during peripheral muscle vibration: An experimental study.</a> Journal of manipulative and physiological therapeutics. 38, 35-43 (2015).</li><li>Rolke, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Quantitative+sensory+testing:+a+comprehensive+protocol+for+clinical+trials.">Quantitative sensory testing: a comprehensive protocol for clinical trials.</a> European Journal of Pain. 10, 77-77 (2006).</li><li>Ayres, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sensory+integration+and+praxis+test+(SIPT).">Sensory integration and praxis test (SIPT).</a> Los Angeles, Western Psychological Services. , (1989).</li><li>Dunn, W., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Somatosensation+assessment+using+the+NIH+Toolbox.">Somatosensation assessment using the NIH Toolbox.</a> Neurology. 80, S41-S44 (2013).</li><li>Dunn, W., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Measuring+Change+in+Somatosensation+Across+the+Lifespan.">Measuring Change in Somatosensation Across the Lifespan.</a> American Journal of Occupational Therapy. 69, 6903290020p6903290021-6903290020p6903290029 (2015).</li><li>Witchalls, J., Blanch, P., Waddington, G., Adams, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intrinsic+functional+deficits+associated+with+increased+risk+of+ankle+injuries:+a+systematic+review+with+meta-analysis.">Intrinsic functional deficits associated with increased risk of ankle injuries: a systematic review with meta-analysis.</a> Br J Sports Med. 46, 515-523 (2012).</li><li>Borstad, A. L., Nichols-Larson, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessing+and+treating+Higher-level+Somatosensory+Impairments+Post+Stroke.">Assessing and treating Higher-level Somatosensory Impairments Post Stroke.</a> Topics in Stroke Rehabilitation. 21, 290-295 (2014).</li><li>Kandel, E. R., Schwartz, J. H., Jessell, T. M., Siegelbaum, S. A., Hudspeth, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Principles of neural science. 4, (2000).</li><li>Goodwin, G. M., Mccloskey, D. I., Matthews, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+contribution+of+muscle+afferents+to+keslesthesia+shown+by+vibration+induced+illusionsof+movement+and+by+the+effects+of+paralysing+joint+afferents.">The contribution of muscle afferents to keslesthesia shown by vibration induced illusionsof movement and by the effects of paralysing joint afferents.</a> Brain. 95, 705-748 (1972).</li><li>Burke, D., Hagbarth, K. E., L&#246;fstedt, L., Wallin, B. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+responses+of+human+muscle+spindle+endings+to+vibration+of+non-contracting+muscles.">The responses of human muscle spindle endings to vibration of non-contracting muscles.</a> The Journal of physiology. 261, 673-693 (1976).</li><li>Roll, J., Vedel, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Kinaesthetic+role+of+muscle+afferents+in+man,+studied+by+tendon+vibration+and+microneurography.">Kinaesthetic role of muscle afferents in man, studied by tendon vibration and microneurography.</a> Experimental Brain Research. 47, 177-190 (1982).</li><li>Wigley, F. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Raynaud's+phenomenon.">Raynaud's phenomenon.</a> New England Journal of Medicine. 347, 1001-1008 (2002).</li><li>Oldfield, R. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+assessment+and+analysis+of+handedness:+the+Edinburgh+inventory.">The assessment and analysis of handedness: the Edinburgh inventory.</a> Neuropsychologia. 9, 97-113 (1971).</li><li>Kito, T., Hashimoto, T., Yoneda, T., Katamoto, S., Naito, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sensory+processing+during+kinesthetic+aftereffect+following+illusory+hand+movement+elicited+by+tendon+vibration.">Sensory processing during kinesthetic aftereffect following illusory hand movement elicited by tendon vibration.</a> Brain research. 1114, 75-84 (2006).</li><li>Carey, L. M., Oke, L. E., Matyas, T. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impaired+limb+position+sense+after+stroke:+a+quantitative+test+for+clinical+use.">Impaired limb position sense after stroke: a quantitative test for clinical use.</a> Arch.Phys.Med.Rehabil. 77, 1271-1278 (1996).</li><li>Roll, J., Vedel, J., Ribot, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Alteration+of+proprioceptive+messages+induced+by+tendon+vibration+in+man:+a+microneurographic+study.">Alteration of proprioceptive messages induced by tendon vibration in man: a microneurographic study.</a> Experimental brain research. 76, 213-222 (1989).</li><li>Calvin-Figui&#232;re, S., Romaigu&#232;re, P., Roll, J. -. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Relations+between+the+directions+of+vibration-induced+kinesthetic+illusions+and+the+pattern+of+activation+of+antagonist+muscles.">Relations between the directions of vibration-induced kinesthetic illusions and the pattern of activation of antagonist muscles.</a> Brain research. 881, 128-138 (2000).</li><li>Fallon, J. B., Macefield, V. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vibration+sensitivity+of+human+muscle+spindles+and+Golgi+tendon+organs.">Vibration sensitivity of human muscle spindles and Golgi tendon organs.</a> Muscle &amp; nerve. 36, 21-29 (2007).</li><li>Seizova-Cajic, T., Smith, J. L., Taylor, J. L., Gandevia, S. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Proprioceptive+movement+illusions+due+to+prolonged+stimulation:+reversals+and+aftereffects.">Proprioceptive movement illusions due to prolonged stimulation: reversals and aftereffects.</a> PloS one. 2, e1037 (2007).</li></ol>

This protocol provides a method to knock down human proprioception in the upper limb. Across 20 healthy participants the effect of proprioceptive knockdown was large as measured by VDT a psychophysical measure of sensitivity thought to reflect A&#945; afferent axon transmission. The VDT was measured as quickly as possible after removal of vibration, when A&#945; afferent discharge is reduced.25 The effect of this protocol on error in reaching to a target with visual occlusion (tBKT) was moderate. ...

Of all contributors to the neural control of movement, proprioception may be the least well measured. Research measures of proprioception using specialized equipment have recently achieved reliability, validity, and precision;1,2,3 in contrast, clinical measures of proprioception, the most common being limb position sense testing,4 have low resolution, are contaminated by other sensory modalities,4 and have poor or no published psychometric properties.5 New precise, reliable measures of proprioception are needed to elucidate peripheral and central mechanisms of proprioceptive control,3 for clinical diagnosis of impairment, and to measure outcomes of proprioceptive training.2,5,6,7 Toward this end, a simple, non-invasive method to temporarily impair or &#39;knockdown&#39; proprioception is needed.
Proprioceptive knockdown in healthy humans allows researchers to infer the role of proprioceptive function in a sensorimotor task, which is useful to inform the development and validation of standardized measures. Knockdown models have two main advantages over studying humans with impaired proprioception. The first is participant availability; individuals with proprioception impairment are not easily accessible to many researchers. Second, unlike in vivo proprioception impairment, knockdown models may allow the ability to control the extent of impairment across participants.
Current published methods of temporary proprioception knockdown of the upper limb are invasive, impractical, or uncomfortable for the participant. Anesthetic injections, while relatively safe, require technical expertise and may be considered invasive by some research participants. Ischemic nerve blocks cause discomfort and a blood test to screen for clotting disorders prior to their application is practiced.8 Cryotherapy also causes discomfort. The average time of application for cryotherapy to impact proprioception is 20.3 &#177; 5.3 min.9 Once cryotherapy is removed, a brief window in which to measure proprioception prior to rewarming remains, which may contribute to the inconsistent effect of cryotherapy on joint position sense.10 High frequency (300 Hz) vibration was used successfully to reduce proprioceptive acuity in a finger movement detection task; the mechanism was reported to be pacinian corpuscle-induced inhibition of input from other vibration sensitive cutaneous receptors.11 Recently, soleus muscle vibration (80 Hz) was found to decrease isometric force production accuracy by distorting proprioceptive information.12 However, a simple non-invasive method for temporary knockdown of upper limb proprioception has not been published.
The purpose of this method is to use high frequency vibration to temporarily knockdown upper limb proprioception in healthy adults. Knockdown was confirmed using two measures, the Vibration Detection Threshold (VDT) and the tablet version of the Brief Kinesthesia Test (tBKT). The VDT is a psychophysical measure of sensitivity thought to reflect A&#945; afferent axon transmission.13 Proprioceptive performance was quantified using the tBKT that is under development in our lab. The Brief Kinesthesia Test (BKT), based on the work of Ayres,14 is an experimental instrument that was tested for but not included in the National Institutes of Health (NIH) Toolbox core batteries.15,16 The BKT includes three reaching trials for each upper limb. The tBKT includes 20 reaching trials per upper limb and is being developed with the goal of improving the psychometric properties over the original test. The tBKT involves a sensory input (examiner guidance of upper limb to target), central processing (remember the spatial location of the target) and a motor output (attempting to locate the target after guidance is removed), thought to be necessary in a measure of overall proprioceptive performance.17 The VDT and the tBKT measurements, represent low and higher levels, respectively, in the somatosensory hierarchy,18 and thus should provide a more comprehensive quantification of proprioception than either measure used alone.
Two neural mechanisms relate most closely to the reduced proprioceptive acuity caused by high frequency vibration. First, Pacinian corpuscles are the cutaneous mechanoreceptor most commonly associated with vibration detection. The continuous vibration used in this protocol likely raises the receptor tuning threshold of vibration detection based on the neural mechanism of short-term habituation in the A&#945; and &#946; fiber group associated with Pacinian corpuscles.19 The physiologic result is that a vibration of the same intensity and frequency, such as 128 Hz used in the VDT test, is felt for a shorter duration. Second, it is thought that muscle spindles, via A&#945; afferent fibers, code muscle length inaccurately following high frequency vibration resulting in distorted proprioceptive information as evidenced by reduced accuracy during force reproduction,12 illusion of movement,20,21 and reduced kinesthesia.22

<table border="0" cellpadding="0" cellspacing="0" width="1075">
	<tbody>
		<tr height="40">
			<td height="40" style="height:40px;width:329px;">Pure Enrichment-Massage Mini with Built in USB Rechargeable Battery</td>
			<td style="width:123px;">ebay</td>
			<td style="width:171px;">None</td>
			<td style="width:455px;">183 Hz cordless vibrator, 7 inches total length including handle</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Chattanooga 2.5 inch velcro strap&#160;</td>
			<td>ebay</td>
			<td>None</td>
			<td>used to secure vibrator to arm</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Tuning Fork C128 ENT Surgical Medical Instruments Exam Diagnostic Tools</td>
			<td>ebay</td>
			<td>None</td>
			<td>Used in VDT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Handheld Digital stop watch</td>
			<td>ebay</td>
			<td>None</td>
			<td>Used to time VDT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Universal Rubber Bands Size 33, 3 1/2 x 1/8 inch</td>
			<td>ebay</td>
			<td>Universal - UNV00433</td>
			<td>used to secure vibrator head to arm</td>
		</tr>
		<tr height="40">
			<td colspan="4" height="40" style="height:40px;">Instructions to build Visual Screen were published here: https://www.jove.com/video/53178/design-fabrication-administration-hand-active-sensation-test&#160;</td>
		</tr>
	</tbody>
</table>

a simple non-invasive method for temporary knockdown of upper limb proprioception

Proprioception may be the least well measured of all contributors to the neural control of movement. New precise, reliable measures of proprioception are needed for clinical diagnosis of impairment, and to measure outcomes of proprioceptive training. The purpose of this simple, non-invasive method is to temporarily knockdown upper limb proprioception in healthy adults, to an extent that would be useful in the development and testing of upper limb proprioception measures. Knockdown models have two main advantages over studying humans with impaired proprioception: participant availability and the ability to control the extent of impairment across participants. Current published methods of temporary proprioception knockdown of the upper limb, such as ischemic nerve blocks and cryotherapy, are invasive, impractical, or uncomfortable for the participant. Here, vibration over the ulnar groove was used to reduce upper limb proprioception. High frequency vibration may reduce proprioceptive acuity by inhibiting pacinian corpuscle-induced input. The effect of vibration used in this protocol was confirmed using two quantitative measures. This method was simple to administer, comfortable for participants, and practical.

Using the protocol presented here, we tested 20 healthy adults, 8 were male (mean age (SD)= 32.5 (12.5) years; 19 right-, and 1 left- handed). The participants had no known pathology involving the upper extremities. Handedness was assessed using the Edinburgh Handedness Inventory.24 Study participants reported no adverse events.
Both upper limbs of each participant were tested using the VDT and the tBKT a...

Watch this Scientific Journal Video about A Simple Non-invasive Method for Temporary Knockdown of Upper Limb Proprioception at JoVE.com

A Simple Non-invasive Method for Temporary Knockdown of Upper Limb Proprioception

The goal of this protocol is to demonstrate a practical method to temporarily interfere with proprioception in the upper limb of healthy humans.

Proprioception may be the least well measured of all contributors to the neural control of movement. New precise, reliable measures of proprioception are ...

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